23.22 The following dissolved-oxygen values were found after 5 days of incubation in 310-mL BOD bottles: 7.7, 7.9, and 7.9 in three blank samples; 6.5, 4.0, and 0.5 mg/L in bottles containing 2, 5, and 10 mL of sample, respectively. The 0-day dissolved oxygen of the sample was 0.0 mg/L. What is the 5-day BOD of the sample? The 5-day Biochemical Oxygen Demand (BOD) of the given wastewater sample is calculated using the following equation:\[ BOD_5 = (DO_{initial} - DO_{final}) \times \text{Dilution factor} \]Where:- **Dilution factor** = \(\frac{\text{volume of BOD bottle}}{\text{volume of wastewater}}\)- \( DO_{initial} \) = Initial dissolved oxygen- \( DO_{final} \) = Final dissolved oxygen**Calculation of the Data for 5 days BOD using the above equation:**1. Calculation 1: \[ BOD_5 = (7.7 - 6.5) \times 155 \] \[ BOD_5 = 186 \]2. Calculation 2: \[ BOD_5 = (7.9 - 4) \times 62 \] \[ BOD_5 = 241.8 \]3. Calculation 3: \[ BOD_5 = (7.7 - 0.5) \times 31 \] \[ BOD_5 = 229.4 \]

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Answered: The following dissolved-oxygen values…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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23.22 The following dissolved-oxygen values were found after 5 days of incubation in 310-mL BOD bottles: 7.7, 7.9, and 7.9 in three blank samples; 6.5, 4.0, and 0.5 mg/L in bottles containing 2, 5, and 10 mL of sample, respectively. The 0-day dissolved oxygen of the sample was 0.0 mg/L. What is the 5-day BOD of the sample?

The 5-day Biochemical Oxygen Demand (BOD) of the given wastewater sample is calculated using the following equation:

\[ BOD_5 = (DO_{initial} - DO_{final}) \times \text{Dilution factor} \]

Where:
- **Dilution factor** = \(\frac{\text{volume of BOD bottle}}{\text{volume of wastewater}}\)
- \( DO_{initial} \) = Initial dissolved oxygen
- \( DO_{final} \) = Final dissolved oxygen

**Calculation of the Data for 5 days BOD using the above equation:**

1. Calculation 1:
\[
BOD_5 = (7.7 - 6.5) \times 155
\]
\[
BOD_5 = 186
\]

2. Calculation 2:
\[
BOD_5 = (7.9 - 4) \times 62
\]
\[
BOD_5 = 241.8
\]

3. Calculation 3:
\[
BOD_5 = (7.7 - 0.5) \times 31
\]
\[
BOD_5 = 229.4
\]

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